Question
Identify general electronic configuration exhibited by 2^ nd series of transition elements.
MHT CET
Chemistry
d and f Block Elements
2026
MHT CET 2026 (19 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. [ Ar ]\ 4d^ 1-10 \ 4s^2
- B. [ Kr ]\ 4d^ 1-10 \ 5s^ 0-2
- C. [ Xe ]\ 4d^ 1-10 \ 4s^2
- D. [ Rn ]\ 4d^ 1-10 \ 6s^2
Answer
B. [ Kr ]\ 4d^ 1-10 \ 5s^ 0-2
Step-by-step solution
The second series of transition elements is the 4d series, which starts from Yttrium (Z=39) and ends at Cadmium (Z=48). The noble gas preceding this series is Krypton ([ Kr ], Z=36). The valence electrons are filled in the 4d and 5s subshells. Due to anomalous configurations (for example, Palladium has the configuration [ Kr ]\ 4d^ 10 \ 5s^0 and elements like Silver have [ Kr ]\ 4d^ 10 \ 5s^1), the number of electrons in the 5s orbital can be 0, 1, or 2. Thus, the general electronic configuration of the 2^ nd transition series is [ Kr ]\ 4d^ 1-10 \ 5s^ 0-2 .
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